Necklace‐Like Structures Composed of Fe3N@C Yolk–Shell Particles as an Advanced Anode for Sodium‐Ion Batteries,Advanced Materials

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Necklace‐Like Structures Composed of Fe3N@C Yolk–Shell Particles as an Advanced Anode for Sodium‐Ion Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2018-06-19 , DOI: 10.1002/adma.201800525
Zhen Li ₁ , Yongjin Fang ₁ , Jintao Zhang ₁ , Xiong Wen David Lou ₁

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It is of great importance to develop cost‐effective electrode materials for large‐scale use of Na‐ion batteries. Here, a binder‐free electrode based on necklace‐like structures composed of Fe₃N@C yolk–shell particles as an advanced anode for Na‐ion batteries is reported. In this electrode, every Fe₃N@C unit has a novel yolk–shell structure, which can accommodate the volumetric changes of Fe₃N during the (de)sodiation processes for superior structural integrity. Moreover, all reaction units are threaded along the carbon fibers, guaranteeing excellent kinetics for the electrochemical reactions. As a result, when evaluated as an anode material for Na‐ion batteries, the Fe₃N@C nano‐necklace electrode delivers a prolonged cycle life over 300 cycles, and achieves a high C‐rate capacity of 248 mAh g⁻¹ at 2 A g⁻¹.

中文翻译：

Fe3N @ C卵黄壳颗粒组成的类似项链的结构，可作为钠离子电池的高级阳极

开发用于Na-ion电池大规模使用的经济有效的电极材料非常重要。在这里，报道了一种基于项链状结构的无粘结剂电极，该结构由Fe ₃ N @ C卵黄壳颗粒组成，是钠离子电池的高级阳极。在该电极中，每个Fe ₃ N @ C单元均具有新颖的蛋黄壳结构，可以适应（去）沉淀过程中Fe ₃ N的体积变化，从而获得出色的结构完整性。此外，所有反应单元均沿碳纤维穿线，从而确保了电化学反应的出色动力学。结果，当被评估为钠离子电池的负极材料时，Fe ₃N @ C纳米项链电极可延长300个循环的循环寿命，并在2 A g ^-1下实现248 mAh g ^-1的高C速率容量。

更新日期：2018-06-19

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